JPH05120672A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH05120672A JPH05120672A JP30560091A JP30560091A JPH05120672A JP H05120672 A JPH05120672 A JP H05120672A JP 30560091 A JP30560091 A JP 30560091A JP 30560091 A JP30560091 A JP 30560091A JP H05120672 A JPH05120672 A JP H05120672A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- weight
- group
- parts
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- 239000011248 coating agent Substances 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 46
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 30
- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract 2
- 229920005989 resin Polymers 0.000 claims description 32
- 239000011347 resin Substances 0.000 claims description 32
- 239000011230 binding agent Substances 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 17
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 claims description 5
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical group C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 claims description 4
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- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
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- 239000003082 abrasive agent Substances 0.000 description 2
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- 125000003545 alkoxy group Chemical group 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
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- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
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- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- 229910052783 alkali metal Inorganic materials 0.000 description 1
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- 125000002947 alkylene group Chemical group 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
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- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
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- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000007942 carboxylates Chemical group 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 229920006218 cellulose propionate Polymers 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
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- 239000003431 cross linking reagent Substances 0.000 description 1
- UOQACRNTVQWTFF-UHFFFAOYSA-N decane-1,10-dithiol Chemical compound SCCCCCCCCCCS UOQACRNTVQWTFF-UHFFFAOYSA-N 0.000 description 1
- VXGWOWKFOJWIIA-UHFFFAOYSA-N decane-1,5,10-trithiol Chemical compound SCCCCCC(S)CCCCS VXGWOWKFOJWIIA-UHFFFAOYSA-N 0.000 description 1
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- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 150000004662 dithiols Chemical class 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
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- GERYADONVBCUHM-UHFFFAOYSA-N dodecyl 2-sulfanylbenzoate Chemical compound CCCCCCCCCCCCOC(=O)C1=CC=CC=C1S GERYADONVBCUHM-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 229950003499 fibrin Drugs 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- SFXUHSUQWJUQQL-UHFFFAOYSA-N hexadecyl 2-methyl-3-sulfanylpropanoate Chemical compound SCC(C(=O)OCCCCCCCCCCCCCCCC)C SFXUHSUQWJUQQL-UHFFFAOYSA-N 0.000 description 1
- WDRMFQRBFDVBPJ-UHFFFAOYSA-N hexadecyl 2-sulfanylacetate Chemical compound CCCCCCCCCCCCCCCCOC(=O)CS WDRMFQRBFDVBPJ-UHFFFAOYSA-N 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- GJRQTCIYDGXPES-UHFFFAOYSA-N iso-butyl acetate Natural products CC(C)COC(C)=O GJRQTCIYDGXPES-UHFFFAOYSA-N 0.000 description 1
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 1
- FGKJLKRYENPLQH-UHFFFAOYSA-M isocaproate Chemical compound CC(C)CCC([O-])=O FGKJLKRYENPLQH-UHFFFAOYSA-M 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropanol acetate Natural products CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 description 1
- 229940011051 isopropyl acetate Drugs 0.000 description 1
- GWYFCOCPABKNJV-UHFFFAOYSA-N isovaleric acid Chemical compound CC(C)CC(O)=O GWYFCOCPABKNJV-UHFFFAOYSA-N 0.000 description 1
- OQAGVSWESNCJJT-UHFFFAOYSA-N isovaleric acid methyl ester Natural products COC(=O)CC(C)C OQAGVSWESNCJJT-UHFFFAOYSA-N 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 229960004488 linolenic acid Drugs 0.000 description 1
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- SEXOVMIIVBKGGM-UHFFFAOYSA-N naphthalene-1-thiol Chemical compound C1=CC=C2C(S)=CC=CC2=C1 SEXOVMIIVBKGGM-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- MFQPKYNLVQZUIZ-UHFFFAOYSA-N octadecyl 2-sulfanylbenzoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C1=CC=CC=C1S MFQPKYNLVQZUIZ-UHFFFAOYSA-N 0.000 description 1
- LFHBOSSJYCHNBJ-UHFFFAOYSA-N octadecyl 2-sulfanylpropanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)S LFHBOSSJYCHNBJ-UHFFFAOYSA-N 0.000 description 1
- OEIJHBUUFURJLI-UHFFFAOYSA-N octane-1,8-diol Chemical compound OCCCCCCCCO OEIJHBUUFURJLI-UHFFFAOYSA-N 0.000 description 1
- KZCOBXFFBQJQHH-UHFFFAOYSA-N octane-1-thiol Chemical compound CCCCCCCCS KZCOBXFFBQJQHH-UHFFFAOYSA-N 0.000 description 1
- 229960002446 octanoic acid Drugs 0.000 description 1
- NZOLACAUTFOHHG-UHFFFAOYSA-N octyl 2-methyl-3-sulfanylpropanoate Chemical compound CCCCCCCCOC(=O)C(C)CS NZOLACAUTFOHHG-UHFFFAOYSA-N 0.000 description 1
- BVWFMZRQRGQJNH-UHFFFAOYSA-N octyl 2-sulfanylbenzoate Chemical compound CCCCCCCCOC(=O)C1=CC=CC=C1S BVWFMZRQRGQJNH-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 229940055577 oleyl alcohol Drugs 0.000 description 1
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 125000005496 phosphonium group Chemical group 0.000 description 1
- 125000002270 phosphoric acid ester group Chemical group 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920006295 polythiol Polymers 0.000 description 1
- 229920003226 polyurethane urea Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical class NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium group Chemical group [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- LXDHBOICPCPCKD-UHFFFAOYSA-N tetradecyl 2-sulfanylacetate Chemical compound CCCCCCCCCCCCCCOC(=O)CS LXDHBOICPCPCKD-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 0.000 description 1
- NBOMNTLFRHMDEZ-UHFFFAOYSA-N thiosalicylic acid Chemical compound OC(=O)C1=CC=CC=C1S NBOMNTLFRHMDEZ-UHFFFAOYSA-N 0.000 description 1
- 229940103494 thiosalicylic acid Drugs 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- IPBROXKVGHZHJV-UHFFFAOYSA-N tridecane-1-thiol Chemical compound CCCCCCCCCCCCCS IPBROXKVGHZHJV-UHFFFAOYSA-N 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は塗布型磁気記録媒体に関
し、さらに詳しくは、非磁性支持体上に少なくとも強磁
性粉末を含有する磁性塗膜を設けてなる磁気記録媒体に
関し、特に六方晶バリウムフェライト、Co―被着γ酸
化鉄、金属粉末等の強磁性粉を用いた記録密度の高い高
密度記録媒体に好適なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating type magnetic recording medium, and more particularly to a magnetic recording medium comprising a non-magnetic support and a magnetic coating film containing at least a ferromagnetic powder, and more particularly hexagonal barium. It is suitable for a high-density recording medium having a high recording density using a ferromagnetic powder such as ferrite, Co-coated γ-iron oxide, and metal powder.
【0002】[0002]
【従来の技術】近年、磁気記録媒体の高密度化が検討さ
れ、強磁性粉として、微小粒径のCo―被着γ酸化鉄、
微小粒径でかつ高保持力の金属磁性粉、六角板状でかつ
微小粒径の六方晶フェライト粉等が注目されている。2. Description of the Related Art In recent years, high density magnetic recording media have been studied, and as a ferromagnetic powder, Co-deposited γ-iron oxide having a small particle size,
Attention has been focused on metal magnetic powder having a small particle size and high coercive force, and hexagonal ferrite powder having a hexagonal plate shape and a minute particle size.
【0003】しかし、これら強磁性粉の塗料化において
は、分散の良否が常に問題となり、未だ十分な解決にい
たっていない。However, when these ferromagnetic powders are used as paints, the quality of the dispersion has always been a problem, and a sufficient solution has not yet been reached.
【0004】例えば六方晶フェライト粉は板面に鉛直な
方向に磁化容易軸を有するため、塗料において粉同士が
その板状の面と面で密着し、極めて強い凝集体を形成す
る。また金属磁性粉は酸化物系磁性粉に比べて大きな、
磁性モーメントを有するため、塗料中においても粉同士
が強力に引き合って極めて強い凝集体を形成する。For example, since hexagonal ferrite powder has an axis of easy magnetization in the direction perpendicular to the plate surface, the powder particles are closely adhered to each other in the paint and form extremely strong agglomerates. In addition, metal magnetic powder is larger than oxide-based magnetic powder,
Since they have a magnetic moment, the powders strongly attract each other even in the paint to form extremely strong aggregates.
【0005】また磁性粉のバインダーとして、塩化ビニ
ル―酢酸ビニル系共重合体、繊維素系樹脂、ポリウレタ
ン系樹脂、ポリエステル系樹脂、ポリエステル―ポリウ
レタン系樹脂、ポリカーボネート―ポリウレタン系樹
脂、ポリビニルブチラール系樹脂など種々のものが分散
性改良のために検討されてきた。しかしながら、十分良
好な結果が得られているとは言えない。As a binder for the magnetic powder, vinyl chloride-vinyl acetate copolymer, fibrin resin, polyurethane resin, polyester resin, polyester-polyurethane resin, polycarbonate-polyurethane resin, polyvinyl butyral resin, etc. Various have been investigated to improve dispersibility. However, it cannot be said that sufficiently good results have been obtained.
【0006】そこで近年特に、磁性粉の分散性、及び充
填性の観点から極性基、例えばスルホン酸塩基、硫酸エ
ステル塩基、リン酸エステル塩基、ホスホン酸塩基、カ
ルボン酸塩基等を、上記結合剤の骨格、または側鎖に付
加した樹脂が広く使用されるようになっている。Accordingly, in recent years, in particular, from the viewpoints of dispersibility and packing of magnetic powder, polar groups such as sulfonate group, sulfate ester group, phosphate ester group, phosphonate group, and carboxylate group are used as binders. Resins added to the skeleton or side chains have been widely used.
【0007】しかし前記の金属磁性粉や六方晶フェライ
ト粉の凝集力は極めて強く、該バインダーを使用しても
凝集体を微分散化することが難しく、不十分な分散性の
塗料しか得られず、満足すべき磁気記録媒体を得ること
は難しい。However, the above-mentioned metal magnetic powder and hexagonal ferrite powder have a very strong cohesive force, and it is difficult to finely disperse the agglomerates even if the binder is used, and only a paint having insufficient dispersibility can be obtained. However, it is difficult to obtain a satisfactory magnetic recording medium.
【0008】[0008]
【発明が解決しようとする課題】本発明の目的は、磁性
塗料の塗工時に発生する欠陥をおさえ、かつ強磁性粉の
分散性、分散安定性を改善して、磁性塗膜のより一層の
表面平滑性と高密度化をはかり、優れた磁気記録特性、
特に高密度磁気記録特性を付与した磁気記録媒体を提供
することにある。The object of the present invention is to suppress defects that occur during the coating of a magnetic coating material and to improve the dispersibility and dispersion stability of the ferromagnetic powder, and to further improve the magnetic coating film. With excellent surface smoothness and high density, excellent magnetic recording characteristics,
In particular, it is to provide a magnetic recording medium having high density magnetic recording characteristics.
【0009】[0009]
【課題を解決するための手段】本発明者らは上記目的を
達成すべく、鋭意研究を重ねた結果、磁性塗料中強磁性
粉とともに分子内にSH基を含有する化合物を共存せし
めることにより、塗料を塗布する工程において発生する
磁性塗膜上の欠陥が低い水準に抑えられ、なおかつ磁性
塗料中での再凝集することが防止され(例えば塗料を長
時間放置した後塗膜化した場合でも、再凝集による“ぶ
つ”がほとんど発生せず)、このため磁性層(磁性塗
膜)の表面平滑性を著しく向上できることを見い出し、
本発明に到達した。Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, by coexisting a compound containing an SH group in the molecule together with a ferromagnetic powder in a magnetic coating, Defects on the magnetic coating film generated in the step of applying the paint are suppressed to a low level, and re-aggregation in the magnetic paint is prevented (for example, even when the paint is left for a long time and then formed into a coating film, It has been found that "bumping" due to re-aggregation hardly occurs. Therefore, the surface smoothness of the magnetic layer (magnetic coating film) can be significantly improved.
The present invention has been reached.
【0010】すなわち、本発明は非磁性支持体上に強磁
性粉を含有する磁性塗料の塗膜を設けてなる磁気記録媒
体であって、該磁性塗料中に分子内にSH基を含有する
化合物を前記強磁性粉100重量部に対して0.01〜
20重量部含有することを特徴とする磁気記録媒体であ
る。That is, the present invention is a magnetic recording medium comprising a magnetic coating film containing a ferromagnetic powder on a non-magnetic support, wherein the magnetic coating compound contains an SH group in the molecule. 0.01 to 100 parts by weight of the ferromagnetic powder
The magnetic recording medium is characterized by containing 20 parts by weight.
【0011】本発明において使用する分子内に−SH基
を含有する化合物(以下“S―化合物”と略称する)
は、下記一般式(I)で表わされるものであり、SH基
はメルカプト基あるいはチオカルボキシル基として、分
子内に導入される。A compound containing a --SH group in the molecule used in the present invention (hereinafter abbreviated as "S-compound")
Is represented by the following general formula (I), and the SH group is introduced into the molecule as a mercapto group or a thiocarboxyl group.
【0012】 X―(SH)m …(I) (m=1〜4の整数) 上記式において、Xは炭化水素基のものが好ましく使用
されるが、分子鎖中カルボキシル基、エーテル基、スル
フィド基、ポリスルフィド基、アミド基、スルホニル基
等々の官能基を1個またはそれ以上含有しているものは
より好ましく使用できる。X- (SH) m (I) (m is an integer of 1 to 4) In the above formula, X is preferably a hydrocarbon group, and a carboxyl group, ether group, sulfide in the molecular chain is used. Those containing one or more functional groups such as a group, a polysulfide group, an amide group and a sulfonyl group can be more preferably used.
【0013】また分子側鎖としてカルボキシ基、ヒドロ
キ基等を含有していてもよい。Xはまた複素環基を含有
していてもよい。Further, it may contain a carboxy group, a hydroxy group or the like as a molecular side chain. X may also contain a heterocyclic group.
【0014】本発明で使用する上記S―化合物は、一般
に悪臭が極めて強く、工業的使用の採用には問題となる
が、幸いにして常圧沸点が150℃以上のS―化合物
は、磁性塗料中に添加した場合、悪臭をほとんど発生し
なくなる。特に常圧沸点が200℃以上のものは、上記
の意味で特に好ましい。The above-mentioned S-compound used in the present invention generally has an extremely bad odor, which poses a problem for industrial use. Fortunately, the S-compound having an atmospheric pressure boiling point of 150 ° C. or higher is a magnetic paint. When added in, almost no odor is generated. Particularly, those having a normal pressure boiling point of 200 ° C. or higher are particularly preferable in the above meaning.
【0015】S―化合物は、S―原子のd―軌道利用能
により、強磁性磁性粉に極めて効果的に配位するせい
か、磁性塗料中での強磁性磁性粉の再凝集を効率的に防
ぐことができる。Since the S-compound is extremely effectively coordinated with the ferromagnetic magnetic powder due to the d-orbital utilization ability of the S-atom, it is possible to efficiently re-aggregate the ferromagnetic magnetic powder in the magnetic paint. Can be prevented.
【0016】再凝集防止能の観点からはS―化合物は立
体的に大きい方が好ましい。From the viewpoint of anti-reaggregation ability, the S-compound is preferably sterically large.
【0017】直鎖または分枝状の分子鎖を持つものは主
鎖構成元素が少なくとも8個以上、より好ましくは10
個以上のものである。構成元素10個以上のものはほぼ
同等の効果を発揮する。Those having a linear or branched molecular chain have at least 8 or more, and more preferably 10 or more main chain constituent elements.
More than one. Those having 10 or more constituent elements exhibit substantially the same effect.
【0018】上記の意味で好ましいS―化合物の例とし
ては、以下のものが挙げられる。すなわち、炭素数が8
以上のチオール類、より具体的にはオクチルメルカプタ
ン、デシルメルカプタン、ドデシルメルカプタン、トリ
デシルメルカプタン、ヘキサデシルメルカプタン、オク
デシルメルカプタン等々が例示される。その他芳香核を
有するメルカプトナフタリン等も例示される。Examples of S-compounds preferable in the above meaning include the following. That is, carbon number is 8
The above thiols, more specifically, octyl mercaptan, decyl mercaptan, dodecyl mercaptan, tridecyl mercaptan, hexadecyl mercaptan, octedecyl mercaptan and the like are exemplified. Other examples include mercaptonaphthalene having an aromatic nucleus.
【0019】またその他ポリチオール類として、キシリ
レンジチオール、1,10―デカンジチオール、1,1
4―テトラデカンジチオール等々のジチオール類、さら
には1,5,10―デカントリチオール等々が例示され
る。Other polythiols include xylylenedithiol, 1,10-decanedithiol, 1,1
Examples include dithiols such as 4-tetradecanedithiol and 1,5,10-decanetrithiol.
【0020】分子内、分子側鎖に官能基を有するS―化
合物の例としては、チオグリコール酸、α―メルカプト
プロピオン酸、β―メルカプトプロピオン酸、チオサリ
チル酸、チオリンゴ酸、3―メルカプト―2―メチルプ
ロピオン酸等のチオカルボン酸のエステル類が例示され
る。Examples of the S-compound having a functional group in the side chain of the molecule include thioglycolic acid, α-mercaptopropionic acid, β-mercaptopropionic acid, thiosalicylic acid, thiomalic acid, 3-mercapto-2- Examples are thiocarboxylic acid esters such as methylpropionic acid.
【0021】モノアルコールの場合炭素数が8〜22個
のアルコールエステルが好ましく使用される。アルコー
ル鎖は直鎖であっても、また例えばオキソ法等々により
製造される分枝アルコールであってもよい。In the case of monoalcohol, an alcohol ester having 8 to 22 carbon atoms is preferably used. The alcohol chain may be a straight chain or a branched alcohol produced by, for example, the oxo method or the like.
【0022】より具体的には、以下のものが挙げられ
る。すなわち、チオグリコール酸デシル、チオグリコー
ル酸ドデシル、チオグリコール酸テトラデシル、チオグ
リコール酸ヘキサデシル、α―メルカプトプロピオン酸
オクチル、β―メルカプトプロピオン酸デシル、α―メ
ルカプトプロピオン酸ドデシル、β―メルカプトプロピ
オン酸トリデシル、α―メルカプトプロピオン酸テトラ
デシル、β―メルカプトプロピオン酸ヘキサデシル、α
―メルカプトプロピオン酸オクタデシル、β―メルカプ
トプロピオン酸ノナデシル、チオサリチル酸オクチル、
チオサリチル酸ドデシル、チオサリチル酸オクタデシ
ル、3―メルカプト―2―メチルプロピオン酸オクチ
ル、3―メルカプト―2―メチルプロピオン酸ドデシ
ル、3―メルカプト―2―メチルプロピオン酸ヘキサデ
シル、3―メルカプト―2―メチルプロピオン酸オクタ
デシル等々を挙げることができる。More specifically, the following can be listed. That is, decyl thioglycolate, dodecyl thioglycolate, tetradecyl thioglycolate, hexadecyl thioglycolate, α-mercaptopropionate octyl, β-mercaptopropionate decyl, α-mercaptopropionate dodecyl, β-mercaptopropionate tridecyl, α-Mercaptopropionate tetradecyl, β-mercaptopropionate hexadecyl, α
-Octadecyl mercaptopropionate, β-nonadecyl mercaptopropionate, octyl thiosalicylate,
Dodecyl thiosalicylate, octadecyl thiosalicylate, octyl 3-mercapto-2-methylpropionate, dodecyl 3-mercapto-2-methylpropionate, hexadecyl 3-mercapto-2-methylpropionate, 3-mercapto-2-methylpropionate Octadecyl and the like can be mentioned.
【0023】また、アルコール部分に不飽和結合を有す
るもの、例えば前記酸のオレイルアルコールエステルな
ども有利に使用できる。Those having an unsaturated bond in the alcohol moiety, such as oleyl alcohol ester of the above-mentioned acid, can also be advantageously used.
【0024】更に式(I)のポリメルカプト化合物は前
記の酸のグリコール、例えばネオペンチルグリコール、
ヘキサンジオール、オクタンジオールとのエステル等を
挙げることができる。Further, the polymercapto compound of the formula (I) is a glycol of the above-mentioned acid, for example neopentyl glycol,
Examples thereof include hexanediol and esters with octanediol.
【0025】その他、トリメチロールプロパン、トリヒ
ドロキシエチルイソシアヌレート、ペンタエリスリトー
ルとのエステルはトリメルカプト化合物、テトラメルカ
プト化合物の具体例である。In addition, esters with trimethylolpropane, trihydroxyethyl isocyanurate and pentaerythritol are specific examples of trimercapto compounds and tetramercapto compounds.
【0026】また、ジメチルカプトトリエチレンジスル
フィド等のチオエーテル基を有するものも有効に使用し
うる。Those having a thioether group such as dimethylcaptotriethylene disulfide can also be effectively used.
【0027】かかるS―化合物は、磁性塗料製造の任意
の段階で、添加することができる。例えば強磁性粉の分
散プロセス、あるいはまたレットダウンの段階、あるい
はまた架橋剤(イソシアナート化合物)を添加した後等
を挙げることができる。The S-compound can be added at any stage of the magnetic coating production. Examples thereof include a dispersion process of ferromagnetic powder, or a stage of letdown, or after addition of a crosslinking agent (isocyanate compound).
【0028】S―化合物の使用量は強磁性粉100重量
部当り、0.01〜20重量部添加することができる。The S-compound can be added in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the ferromagnetic powder.
【0029】特に磁性塗料の塗布性向上のためには0.
5〜15重量部添加するのが好ましく、またさらに塗膜
分散安定性向上のためには0.5〜13重量部の範囲が
好ましく選択される。Particularly, in order to improve the coating property of the magnetic paint,
It is preferable to add 5 to 15 parts by weight, and to improve the dispersion stability of the coating film, a range of 0.5 to 13 parts by weight is preferably selected.
【0030】本発明において非磁性支持体は特に制限が
なく、通常使用されているものを用いることができる。
非磁性支持体を形成する素材の例としては、ポリエチレ
ンテレフタレート、ポリエチレン―2,6―ナフタレー
ト、ポリエチレン、ポリプロピレン、ポリカーボネー
ト、ポリアミド、ポリアミドイミド、ポリイミド、ポリ
サルホン、ポリエーテルサルホンなどの各種の合成樹脂
のフイルム、およびアルミニウム箔、ステンレス箔など
の金属箔を挙げることができる。In the present invention, the non-magnetic support is not particularly limited, and those commonly used can be used.
Examples of materials forming the non-magnetic support include various synthetic resins such as polyethylene terephthalate, polyethylene-2,6-naphthalate, polyethylene, polypropylene, polycarbonate, polyamide, polyamideimide, polyimide, polysulfone and polyethersulfone. Films and metal foils such as aluminum foil and stainless steel foil can be mentioned.
【0031】本発明において強磁性粉は制限がなく、通
常使用されているものを用いることができるが、特にC
o―被着γ酸化鉄粉、Feを主体とする金属粉、六方晶
バリウムフェライト粉等が好ましい。更にCo―被着γ
酸化鉄粉としては、飽和磁化が70emu/gより大き
く、比表面積が20〜60m2 /g、針状比(軸比)が
5〜15、抗磁力が400〜1000 Oe(エルステ
ッド)のものが好ましい。またFeを主体とする金属粉
としては、飽和磁化が100emu/gより大きく、比
表面積が30〜70m2 /g、針状比が5〜15、抗磁
力が500〜3000 Oeの範囲にあるものが好まし
い。また六方晶バリウムフェライト粉としては、飽和磁
化が50emu/gより大きく、比表面積が25〜60
m2 /g、板状比が2〜10、抗磁力が200〜200
0 Oeの範囲にあるものが好ましい。In the present invention, there is no limitation on the ferromagnetic powder, and those commonly used can be used.
O-coated γ-iron oxide powder, Fe-based metal powder, hexagonal barium ferrite powder and the like are preferable. Co-deposition γ
As the iron oxide powder, one having a saturation magnetization of more than 70 emu / g, a specific surface area of 20 to 60 m 2 / g, an acicular ratio (axial ratio) of 5 to 15, and a coercive force of 400 to 1000 Oe (Oersted) is used. preferable. Further, as the metal powder mainly composed of Fe, one having a saturation magnetization of more than 100 emu / g, a specific surface area of 30 to 70 m 2 / g, an acicular ratio of 5 to 15, and a coercive force of 500 to 3000 Oe. Is preferred. The hexagonal barium ferrite powder has a saturation magnetization of more than 50 emu / g and a specific surface area of 25 to 60.
m 2 / g, plate ratio 2 to 10, coercive force 200 to 200
Those in the range of 0 Oe are preferable.
【0032】本発明において磁性塗料は、このような強
磁性粉およびS―化合物を結合剤と混合、分散させて調
製するが、この分散プロセスとしては公知の方法あるい
は当業界に蓄積された方法を用いることができる。In the present invention, the magnetic coating material is prepared by mixing and dispersing such a ferromagnetic powder and S-compound with a binder. As the dispersion process, a known method or a method accumulated in the art can be used. Can be used.
【0033】なお、本発明においては、結合剤は特に制
限されないが、スルホン酸塩基、スルホベタイン基の少
なくとも1種を含有するものが好ましく適用される。In the present invention, the binder is not particularly limited, but a binder containing at least one of a sulfonate group and a sulfobetaine group is preferably applied.
【0034】スルホン酸塩基、スルホベタイン基の少な
くとも1種を有する樹脂としては、分子中にスルホン酸
塩基、スルホベタイン基の少なくとも1種を有する樹脂
であれば如何なるものでもよく、そのような樹脂として
は、例えばウレタン樹脂、ポリエステル樹脂、塩化ビニ
ル系共重合体、塩化ビニリデン系共重合体、アクリル系
樹脂、ブタジエン―アクリロニトリル系重合体、スチレ
ン―ブタジエン系共重合体などが挙げられる。The resin having at least one of sulfonate group and sulfobetaine group may be any resin having at least one of sulfonate group and sulfobetaine group in the molecule. Examples include urethane resins, polyester resins, vinyl chloride-based copolymers, vinylidene chloride-based copolymers, acrylic resins, butadiene-acrylonitrile-based polymers, and styrene-butadiene-based copolymers.
【0035】かかる極性基導入結合剤は、市販のものを
利用してもよく、所望により公知文献の手法に従ってあ
るいは一部修正して、製造することができる。これらの
ものの若干例を引用すると、ポリエステル系結合剤の製
造:特開昭54―143117号、同54―15141
7号、同54―157603号、同56―74827
号、同59―132418号、同59―172118
号、同60―55514号、特開平1―95126号の
各公報、ポリウレタン系結合剤の製造:特開昭57―9
2423号、同58―41436号、同61―2023
27号、同62―28927号、同62―66420
号、特開平1―115920号の各公報、ポリウレタ
ン、ポリウレア系結合剤の製造:特開昭62―2892
0号公報、ビニル重合系結合剤の製造:特開昭58―1
08032号、同60―121514号、同61―32
216号、同61―39927号、同62―20841
9号の各公報、ベタイン系(その他)結合剤の製造:特
開昭60―177427号公報等々が挙げられる。As the polar group-introduced binder, a commercially available binder may be used, and it can be produced according to a method of a known document or partially modified if desired. To give some examples of these, the production of polyester binders: JP-A-54-143117 and JP-A-54-15141.
No. 7, No. 54-157603, No. 56-74827
No. 59-132418, No. 59-172118
No. 60-55514, JP-A-1-95126, and the production of polyurethane binders: JP-A-57-9
No. 2423, No. 58-41436, No. 61-2023
No. 27, No. 62-28927, No. 62-66420
No. 1, JP-A 1-115920, Production of polyurethane and polyurea binders: JP-A-62-2892
No. 0, Production of vinyl polymerization binder: JP-A-58-1
08032, 60-121514, 61-32
No. 216, No. 61-39927, No. 62-20841
No. 9, the preparation of betaine (other) binders: JP-A-60-177427 and the like.
【0036】上記極性基の樹脂中含量は、少なくとも1
×10-6当量/g(樹脂)以上であることが好ましく、
更に磁性粉の分散および再凝集防止の点から、より好ま
しくは1×10-6〜1×10-2当量/g(樹脂)、特に
好ましくは1×10-5〜1×10-2当量/g(樹脂)の
範囲である。The content of the polar group in the resin is at least 1.
It is preferably × 10 −6 equivalent / g (resin) or more,
Further, from the viewpoint of dispersion of magnetic powder and prevention of re-aggregation, more preferably 1 × 10 −6 to 1 × 10 −2 equivalent / g (resin), particularly preferably 1 × 10 −5 to 1 × 10 −2 equivalent / It is in the range of g (resin).
【0037】かかる極性基含有樹脂の使用量は、強磁性
粉100重量部当り0.1〜50重量部、更に0.5〜
40重量部、特に1〜30重量部であることが好まし
い。極性基含有樹脂は、単に重量割合だけでなく樹脂中
の極性基量も考え、強磁性粉100g当りの極性基の量
を1×10-6〜1×10-2当量/100g磁性粉、更に
2×10-6〜1×10-2当量/100g磁性粉、特に5
×10-6〜5×10-3当量/100g磁性粉とするのが
好ましい。The amount of the polar group-containing resin used is 0.1 to 50 parts by weight, and further 0.5 to 100 parts by weight per 100 parts by weight of the ferromagnetic powder.
It is preferably 40 parts by weight, particularly preferably 1 to 30 parts by weight. Regarding the polar group-containing resin, considering not only the weight ratio but also the amount of polar groups in the resin, the amount of polar groups per 100 g of ferromagnetic powder is 1 × 10 −6 to 1 × 10 −2 equivalent / 100 g of magnetic powder, 2 × 10 −6 to 1 × 10 −2 equivalent / 100 g magnetic powder, especially 5
It is preferable to use x10 -6 to 5x10 -3 equivalent / 100 g of magnetic powder.
【0038】本発明における磁性塗料には、前述した強
磁性粉、S―化合物、スルホン酸塩含有樹脂の他に、従
来から知られ、あるいは用いられている成分を含有させ
ることができる。例えば、熱可塑性樹脂、熱硬化性樹
脂、反応型樹脂等の如き結合剤、研磨剤、帯電防止剤、
強化剤、分散剤、潤滑剤などを単独あるいは組合せて含
有させることができる。The magnetic coating material of the present invention may contain components conventionally known or used in addition to the above-mentioned ferromagnetic powder, S-compound and sulfonate-containing resin. For example, a binder such as a thermoplastic resin, a thermosetting resin, and a reactive resin, an abrasive, an antistatic agent,
Reinforcing agents, dispersants, lubricants and the like can be contained alone or in combination.
【0039】この熱可塑性樹脂としては軟化温度が15
0℃以下、平均分子量が10,000〜300,00
0、重合度が約50〜2,000程度のもので、例えば
塩化ビニル・酢酸ビニル共重合体、塩化ビニル・塩化ビ
ニリデン共重合体、塩化ビニル・アクリロニトリル共重
合体、アクリル酸エステル・アクリロニトリル共重合
体、アクリル酸エステル・塩化ビニリデン共重合体、ア
クリル酸エステル・スチレン共重合体、メタクリル酸エ
ステル・アクリロニトリル共重合体、メタクリル酸エス
テル・塩化ビニリデン共重合体、メタクリル酸エステル
・スチレン共重合体、ウレタンエラストマー、ナイロン
―シリコン系樹脂、ニトロセルロース―ポリアミド樹
脂、ポリフッ化ビニル、塩化ビニリデン・アクリロニト
リル共重合体、ブタジエン・アクリロニトリル共重合
体、ポリアミド樹脂、ポリビニルブチラール、セルロー
ス誘導体(セルロースアセテートブチレート、セルロー
スダイアセテート、セルローストリアセテート、セルロ
ースプロピオネート、ニトロセルロース等)、スチレン
・ブタジエン共重合体、ポリエステル樹脂、クロロビニ
ルエーテル・アクリル酸エステル共重合体、アミノ樹
脂、各種の合成ゴム系の熱可塑性樹脂およびこれらの混
合物等が使用される。The softening temperature of this thermoplastic resin is 15
0 ° C. or less, average molecular weight 10,000 to 300,000
0, having a degree of polymerization of about 50 to 2,000, for example, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / acrylonitrile copolymer, acrylic ester / acrylonitrile copolymer Coalescence, acrylic acid ester / vinylidene chloride copolymer, acrylic acid ester / styrene copolymer, methacrylic acid ester / acrylonitrile copolymer, methacrylic acid ester / vinylidene chloride copolymer, methacrylic acid ester / styrene copolymer, urethane Elastomer, nylon-silicone resin, nitrocellulose-polyamide resin, polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymer, butadiene-acrylonitrile copolymer, polyamide resin, polyvinyl butyral, cellulose derivative (cellulose acetate Tate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, etc.), styrene / butadiene copolymer, polyester resin, chlorovinyl ether / acrylic acid ester copolymer, amino resin, various synthetic rubber Thermoplastic resins and mixtures thereof are used.
【0040】熱硬化性樹脂または反応型樹脂としては塗
布液の状態では200,000以下の分子量であり、塗
布、乾燥後に加熱することにより、縮合、付加等の反応
により分子量は無限大のものになる。また、これらの樹
脂のなかで、樹脂が熱分解するまでの間に軟化または溶
融しないものが好ましい。具体的には例えばフェノール
樹脂、エポキシ樹脂、ポリウレタン硬化型樹脂、尿素樹
脂、メラミン樹脂、アルキッド樹脂、シリコン樹脂、ア
クリル系反応樹脂、エポキシ―ポリアミド樹脂、ニトロ
セルロースメラミン樹脂、高分子量ポリエステル樹脂と
イソシアネートプレポリマーの混合物、メタクリル酸塩
共重合体とジイソシアネートプレポリマーの混合物、ポ
リエステルポリオールとポリイソシアネートとの混合
物、尿素ホルムアルデヒド樹脂、低分子量グリコール/
高分子量ジオール/トリフェニルメタントリイソシアネ
ートの混合物、ポリアミン樹脂およびこれらの混合物等
を挙げることができる。The thermosetting resin or the reactive resin has a molecular weight of 200,000 or less in the state of a coating solution, and by heating after coating and drying, the molecular weight becomes infinite due to reactions such as condensation and addition. Become. Further, among these resins, those which are not softened or melted before the resin is thermally decomposed are preferable. Specifically, for example, phenol resin, epoxy resin, polyurethane curable resin, urea resin, melamine resin, alkyd resin, silicone resin, acrylic reaction resin, epoxy-polyamide resin, nitrocellulose melamine resin, high molecular weight polyester resin and isocyanate prepolymer. Polymer mixture, methacrylate copolymer and diisocyanate prepolymer mixture, polyester polyol and polyisocyanate mixture, urea formaldehyde resin, low molecular weight glycol /
Examples thereof include a mixture of high molecular weight diol / triphenylmethane triisocyanate, a polyamine resin and a mixture thereof.
【0041】これらの結合剤の単独または組合されたも
のが使われる。磁性層の強磁性微粉末と結合剤との混合
割合は重量比で、強磁性微粉末100重量部に対して、
結合剤5〜300重量部の範囲で使用される。These binders may be used alone or in combination. The mixing ratio of the ferromagnetic fine powder and the binder in the magnetic layer is a weight ratio, and is based on 100 parts by weight of the ferromagnetic fine powder.
The binder is used in the range of 5 to 300 parts by weight.
【0042】研磨剤としては、一般に使用される材料で
溶融アルミナ、炭化ケイ素、酸化クロム(Cr
2 O3 )、コランダム、人造コランダム、ダイアモン
ド、人造ダイアモンド、ザクロ石、エメリー(主成分:
コランダムと磁鉄鉱)等が使用される。これらの研磨剤
はモース硬度が5以上であり、平均粒子径が0.05〜
5μmの大きさのものが効果があり、好ましくは0.4
〜1.5μmである。これらの研磨剤は結合剤100重
量部に対して7〜15重量部の範囲で添加される。この
量が7重量部より少ないと十分な耐久性が得られず、ま
た15重量部より多すぎると充填度が減少し、十分な出
力が得られない。As the polishing agent, commonly used materials are fused alumina, silicon carbide, and chromium oxide (Cr
2 O 3 ), corundum, artificial corundum, diamond, artificial diamond, garnet, emery (main component:
Corundum and magnetite) are used. These abrasives have a Mohs hardness of 5 or more and an average particle size of 0.05 to
Those having a size of 5 μm are effective, and preferably 0.4
Is about 1.5 μm. These abrasives are added in the range of 7 to 15 parts by weight based on 100 parts by weight of the binder. When the amount is less than 7 parts by weight, sufficient durability cannot be obtained, and when the amount is more than 15 parts by weight, the filling degree is reduced and sufficient output cannot be obtained.
【0043】帯電防止剤としては、カーボンブラック、
カーボンブラックグラフトポリマーなどの導電性微粉
末;サポニンなどの天然界面活性剤;アルキレンオキサ
イド系、グリセリン系、グリシドール系などのノニオン
界面活性剤;高級アルキルアミン類、第4級アンモニウ
ム塩類、ピリジンその他の複素環類、ホスホニウムまた
はスルホニウム類などのカチオン界面活性剤;カルボン
酸、スルホン酸、燐酸、硫酸エステル基、燐酸エステル
基等の酸性基を含むアニオン界面活性剤;アミノ酸類、
アミノスルホン酸類、アミノアルコールの硫酸または燐
酸エステル類等の両性活性剤などが使用される。As the antistatic agent, carbon black,
Conductive fine powder such as carbon black graft polymer; natural surfactant such as saponin; nonionic surfactant such as alkylene oxide type, glycerin type, glycidol type; higher alkylamines, quaternary ammonium salts, pyridine and other complex Cationic surfactants such as rings, phosphoniums or sulfoniums; anionic surfactants containing an acidic group such as carboxylic acid, sulfonic acid, phosphoric acid, sulfuric acid ester group, phosphoric acid ester group; amino acids,
Amphoteric activators such as amino sulfonic acids, sulfuric acid or phosphoric acid esters of amino alcohols, etc. are used.
【0044】上記の導電性微粉末は結合剤100重量部
に対して0.2〜20重量部が、界面活性剤は0.1〜
10重量部の範囲で添加される。The conductive fine powder is 0.2 to 20 parts by weight with respect to 100 parts by weight of the binder, and the surface active agent is 0.1 to 20 parts by weight.
It is added in the range of 10 parts by weight.
【0045】これらの界面活性剤は単独または混合して
用いられるものであるが、時としてその他の目的、例え
ば分散、磁気特性の改良、潤滑性の改良、塗布助剤とし
て適用される場合もある。These surfactants are used alone or as a mixture, but sometimes they are used for other purposes such as dispersion, improvement of magnetic properties, improvement of lubricity, and coating aid. ..
【0046】分散剤(顔料湿潤剤)としては、カプリル
酸、カプリン酸、ラウリン酸、ミリスチン酸、パルミチ
ン酸、ステアリン酸、オレイン酸、エライジン酸、リノ
ール酸、リノレン酸、ステアロール酸等の炭素数12〜
22の脂肪酸(R1 COOH、R1 は炭素数11〜22
のアルキルまたはアルケニル基);前記の脂肪酸のアル
カリ金属(Li、Na、K等)またはアルカリ土類金属
(Mg、Ca、Ba)からなる金属石鹸;前記の脂肪酸
エステルの弗素を含有した化合物;前記の脂肪酸のアミ
ド;ポリアルキレンオキサイドアルキルリン酸エステ
ル;レシチン;トリアルキルポリオレフィンオキシ第4
級アンモニウム塩(アルキルは炭素数1〜5、オレフィ
ンはエチレン、プロピレンなど);その他カップリング
剤(例えばシランカップリング剤、チタンカップリング
剤等)等が使用される。この他に炭素数12以上の高級
アルコール、およびこれらの他に硫酸エステル等も使用
可能である。これらの分散剤は、結合剤100重量部に
対して、0.5〜20重量部の範囲で添加される。As the dispersant (pigment wetting agent), the carbon number of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, stearolic acid, etc. 12-
22 fatty acids (R 1 COOH, R 1 has 11 to 22 carbon atoms
An alkyl or alkenyl group); a metal soap comprising an alkali metal (Li, Na, K, etc.) or alkaline earth metal (Mg, Ca, Ba) of the above fatty acid; a fluorine-containing compound of the above fatty acid ester; Amides of fatty acids; polyalkylene oxide alkyl phosphates; lecithin; trialkyl polyolefinoxy fourth
Quaternary ammonium salt (alkyl has 1 to 5 carbon atoms, olefin has ethylene, propylene, etc.); other coupling agents (for example, silane coupling agent, titanium coupling agent, etc.) and the like are used. In addition to these, higher alcohols having 12 or more carbon atoms, and other than these, sulfuric acid ester and the like can be used. These dispersants are added in the range of 0.5 to 20 parts by weight with respect to 100 parts by weight of the binder.
【0047】潤滑剤としては、ジアルキルポリシロキサ
ン(アルキルは炭素数1〜5)、ジアルコキシポリシロ
キサン(アルコキシは炭素数1〜4)、モノアルキルモ
ノアルコキシポリシロキサン(アルキルは炭素数1〜
5、アルコキシは炭素数1〜4)、フェニルポリシロキ
サン、フロロアルキルポリシロキサン(アルキルは炭素
数1〜5)などのシリコンオイル;グラファイトなどの
導電性微粉末;二硫化モリブデン、二硫化タングステン
などの無機微粉末;ポリエチレン、ポリプロピレン、ポ
リエチレン・塩化ビニル共重合体、ポリテトラフルオロ
エチレンなどのプラスチック微粉末;α―オレフィン重
合物;常温で液状の不飽和脂肪族炭化水素(n―オレフ
ィン二重結合が末端の炭素に結合した化合物、炭素数約
20);炭素数12〜20の一塩基性脂肪酸と炭素数3
〜12の一価のアルコールからなる脂肪酸エステル類、
フルオロカーボン類などが例示される。これらの潤滑剤
は、結合剤100重量部に対して、0.2〜20重量部
の範囲で添加される。As the lubricant, dialkyl polysiloxane (alkyl has 1 to 5 carbon atoms), dialkoxy polysiloxane (alkoxy has 1 to 4 carbon atoms), monoalkyl monoalkoxy polysiloxane (alkyl has 1 to 5 carbon atoms).
5. Alkoxy has 1 to 4 carbon atoms, silicon oil such as phenyl polysiloxane, fluoroalkyl polysiloxane (alkyl has 1 to 5 carbon atoms), conductive fine powder such as graphite, molybdenum disulfide, tungsten disulfide, etc. Inorganic fine powder; polyethylene, polypropylene, polyethylene-vinyl chloride copolymer, polytetrafluoroethylene, and other plastic fine powder; α-olefin polymer; unsaturated aliphatic hydrocarbons that are liquid at room temperature (n-olefin double bond Compound bound to terminal carbon, carbon number about 20); monobasic fatty acid having 12 to 20 carbon atoms and 3 carbon atoms
Fatty acid esters consisting of ~ 12 monohydric alcohols,
Examples are fluorocarbons. These lubricants are added in the range of 0.2 to 20 parts by weight with respect to 100 parts by weight of the binder.
【0048】硬化剤としては低分子量イソシアネート化
合物が好ましく用いられる。この低分子量イソシアネー
ト化合物としては、トリレンジイソシアネート、4,
4′―ジフェニルメタンジイソシアネート、ヘキサメチ
レンジイソシアネート、キシリレンジイソシアネート、
ナフチレン―1,5―ジイソシアネート、o―トルイジ
ンジイソシアネート、イソホロンジイソシアネート、ト
リフェニルメタントリイソシアネート等のイソシアネー
ト類、また当該イソシアネート類とポリアルコールとの
生成物、またイソシアネート類の縮合によって生成した
ポリイソシアネート類を例示することができる。これら
低分子量イソシアネート化合物の市販されている商品名
としては、コロネートL、コロネートHL、コロネート
2030、コロネート2031、ミリオネートMR、ミ
リオネートMTL(日本ポリウレタン(株)製)、タケ
ネートD―102、タケネートD―110N、タケネー
トD―200、タケネートD―202(武田薬品(株)
製)、デスモジュールL、デスモジュール1L、デスモ
ジュールN、デスモジュールHL(住友バイエル(株)
製)等を例示することができる。これらは単独もしくは
硬化反応性の差を利用して二つもしくはそれ以上の組合
せによって使用することができる。A low molecular weight isocyanate compound is preferably used as the curing agent. As the low molecular weight isocyanate compound, tolylene diisocyanate, 4,
4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate,
Isocyanates such as naphthylene-1,5-diisocyanate, o-toluidine diisocyanate, isophorone diisocyanate, and triphenylmethane triisocyanate, products of the isocyanates and polyalcohols, and polyisocyanates formed by condensation of the isocyanates It can be illustrated. Commercially available trade names of these low molecular weight isocyanate compounds are Coronate L, Coronate HL, Coronate 2030, Coronate 2031, Millionate MR, Millionate MTL (manufactured by Nippon Polyurethane Co., Ltd.), Takenate D-102, Takenate D-110N. , Takenate D-200, Takenate D-202 (Takeda Pharmaceutical Co., Ltd.)
Made), Death Module L, Death Module 1L, Death Module N, Death Module HL (Sumitomo Bayer Ltd.)
Manufactured) and the like. These can be used alone or in combination of two or more by utilizing the difference in curing reactivity.
【0049】本発明における磁性塗料は、従来公知の方
法で製造できる。The magnetic coating material of the present invention can be manufactured by a conventionally known method.
【0050】磁性塗料の調製に使用する溶媒としては有
機溶媒が好ましい。この有機溶媒としては、例えば任意
の比率で、アセトン、メチルエチルケトン、メチルイソ
ブチルケトン、シクロヘキサノン、イソホロン、テトラ
ヒドロフラン等のケトン系溶媒;酢酸メチル、酢酸エチ
ル、酢酸ブチル、酢酸イソブチル、酢酸イソプロピル、
乳酸エチル、酢酸グリコール、モノエチルエーテル等の
エステル系溶媒;エーテル、グリコールジメチルエーテ
ル、ジオキサンなどのグリコールエーテル系溶媒;ベン
ゼン、トルエン、キシレン、クレゾール、クロルベンゼ
ン、スチレンなどのタール系溶媒(芳香族炭化水素);
メチレンクロライド、エチレンクロライド、四塩化炭
素、クロロホルム、エチレンクロルヒドリン、ジクロル
ベンゼン等の塩素化炭化水素、N,N―ジメチルホルム
アルデヒド、ヘキサン等が使用できる。An organic solvent is preferable as the solvent used for preparing the magnetic coating material. Examples of the organic solvent include ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone, and tetrahydrofuran in any ratio; methyl acetate, ethyl acetate, butyl acetate, isobutyl acetate, isopropyl acetate,
Ester-based solvents such as ethyl lactate, glycol acetate and monoethyl ether; glycol ether-based solvents such as ether, glycol dimethyl ether and dioxane; tar-based solvents such as benzene, toluene, xylene, cresol, chlorobenzene and styrene (aromatic hydrocarbons) );
Chlorinated hydrocarbons such as methylene chloride, ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin and dichlorobenzene, N, N-dimethylformaldehyde and hexane can be used.
【0051】強磁性粉および上述の各成分の混練分散に
あたっては、強磁性粉および各成分を全て同時に、ある
いは個々に順次に分散機に投入する。例えば、分散剤等
を含む溶剤中に磁性粉を加え、所定の時間分散をつづけ
て磁性塗料とする方法などがある。In kneading and dispersing the ferromagnetic powder and the above-mentioned respective components, the ferromagnetic powder and the respective components are all charged simultaneously or individually into a disperser. For example, there is a method in which magnetic powder is added to a solvent containing a dispersant and the dispersion is continued for a predetermined time to obtain a magnetic coating material.
【0052】磁性塗料の混練分散にあたっては各種の分
散機が使用できる。例えば二本ロールミル、三本ロール
ミル、ボールミル、ペブルミル、トロンミル、サンドグ
ライダー、ゼグバリ(Szegvari)アトライター、高速イ
ンペラー分散機、高速ストーンミル、高速度衝撃ミル、
ディスパー、ニーダー、高速ミキサー、ホミジナイザ
ー、超音波分散機などを用いることができる。Various dispersers can be used for kneading and dispersing the magnetic paint. For example, two roll mill, three roll mill, ball mill, pebble mill, tron mill, sand glider, Szegvari attritor, high speed impeller disperser, high speed stone mill, high speed impact mill,
A disper, a kneader, a high speed mixer, a homogenizer, an ultrasonic disperser or the like can be used.
【0053】また、混練分散に関する技術として、ディ
ー・シー・パットン著“塗料の流動と顔料分散”(19
75年)に記載されている技術を用いることができる。As a technique for kneading and dispersing, see D. Patton, "Paint Flow and Pigment Dispersion" (19
1975) can be used.
【0054】かくして得られる磁性塗料を非磁性支持体
上に塗布する方法は従来公知の方法を用いることができ
る。例えば多層同時塗布法によって同時に2層以上の磁
性層を設けてもよい。A conventionally known method can be used as a method for coating the thus obtained magnetic coating material on a non-magnetic support. For example, two or more magnetic layers may be simultaneously provided by a multi-layer simultaneous coating method.
【0055】かかる方法により、支持体上に塗布された
磁性層は必要により前記のように層中の磁性体を無配向
させる処理を施したのち、形成した磁性層を乾燥する。
また必要により表面平滑化加工を施したり、所望の形状
に打ち抜いたりして磁気ディスクとする。According to such a method, the magnetic layer coated on the support is optionally subjected to the treatment for non-orienting the magnetic material in the layer as described above, and then the formed magnetic layer is dried.
If necessary, the surface is smoothed or punched into a desired shape to obtain a magnetic disk.
【0056】磁性層の厚みは乾燥厚みで約0.2〜12
μm、好ましくは0.3〜4μmの範囲となるように塗
布する。重層の場合は合計で上記の範囲とされる。ま
た、この乾燥厚みは磁気記録媒体の用途、形状、規格な
どにより決めるとよい。The magnetic layer has a dry thickness of about 0.2 to 12
It is applied so that it is in the range of μm, preferably 0.3 to 4 μm. In the case of multiple layers, the total is within the above range. The dry thickness may be determined depending on the use, shape, standard, etc. of the magnetic recording medium.
【0057】この磁性層は強磁性粉の分散不良や再凝集
に起因する表面欠陥および塗布時の表面欠陥が極めて少
なく、表面平滑性に極めて優れ、例えば中心線平均粗さ
(Ra)で0.020μm以下と極めて平滑であり、ノ
イズが少なくS/N比が良好であり、さらに短波長にお
ける記録特性が著しく向上した磁性層である。This magnetic layer has very few surface defects due to poor dispersion and re-aggregation of ferromagnetic powder and surface defects during coating, and has extremely excellent surface smoothness, for example, a center line average roughness (Ra) of 0. The magnetic layer is 020 μm or less, extremely smooth, has little noise, has a good S / N ratio, and has significantly improved recording characteristics at a short wavelength.
【0058】[0058]
【実施例】以下、フレキシブル磁気ディスクの実施例を
掲げて本発明をさらに説明する。なお、例中の特性は次
の方法で求めた。EXAMPLES The present invention will be further described with reference to examples of flexible magnetic disks. The properties in the examples were obtained by the following methods.
【0059】1.塗料分散度 磁性塗料を厚み75μmのポリエチレンテレフタレート
フイルムの表面に乾燥後厚みが3.0±1.0μmとな
るように塗布し、乾燥、平滑化処理をする。得られた塗
膜を微分位相差顕微鏡(倍率:100倍)で観察し、任
意の1視野で視野内の径20μm以上の凹凸の数をカウ
ントし、その数をもって塗料分散度とする。1. Dispersion degree of coating material A magnetic coating material is applied on the surface of a polyethylene terephthalate film having a thickness of 75 μm so that the thickness after drying becomes 3.0 ± 1.0 μm, followed by drying and smoothing treatment. The obtained coating film is observed with a differential phase contrast microscope (magnification: 100 times), the number of irregularities having a diameter of 20 μm or more in the visual field is counted in one arbitrary visual field, and the number is defined as the paint dispersity.
【0060】2.塗布性 前記の1項記載の塗布をグラビアコーターで100メー
トルの長さ実施し、ブレード型スムーサーの後で発生す
るすじ状の欠陥の本数を数えた。基準塗料塗布時に発生
するすじ状欠陥との比をもって、塗布性の判定とした。2. Coating Property The coating described in the above item 1 was carried out with a gravure coater for a length of 100 meters, and the number of streak-like defects generated after the blade type smoother was counted. The applicability was judged based on the ratio with the streak-like defects generated when the standard paint was applied.
【0061】3.ハイパスモジュレーション 隣り合う100ビット単位の平均信号強度を測定し、こ
れらをA,Bとするとき、[(A−B)/(A+B)]
×100でのワースト〜10の平均値で示す。 4.S/N(信号/雑音)比 ディスクの記録領域の最インナーで記録波長0.7μm
において測定した。3. High-pass modulation When the average signal strength of 100-bit units adjacent to each other is measured and these are designated as A and B, [(A−B) / (A + B)]
The average value from worst to 10 at × 100 is shown. 4. S / N (signal / noise) ratio Recording wavelength 0.7 μm at the innermost part of the recording area of the disc
Was measured at.
【0062】[0062]
【実施例1〜7、比較例1】実施例1〜5の磁性塗料を
以下のようにして調製した。すなわち、以下の 六方晶バリウムフェライト 80重量部 [比表面積:50m2 /g、抗磁力 750 Oe 板状比:6] S―化合物(表1参照) (表1参照) ポリウレタン 6重量部 [協和醗酵工業;エステン5701 F1 ] 塩ビ・酢ビ樹脂 6重量部 [日信化学(株)TA-5C ] α―アルミナ 5重量部 [住友化学(株)AKP-20] オレイン酸オレイル 5重量部 カーボンブラック 5重量部 [三菱化成(株)#3950 ] ガーファック RE610 3重量部 [東邦化学(株)] シクロヘキサノン 400重量部 よりなる組成物をサンドグラインダーで混合分散した
後、 コロネートL 10重量部 (日本ポリウレタン(株):低分子量イソシアナ-ト ) を添加し、さらに高速ディスパー中で混合し、磁性塗料
を調製した。Examples 1 to 7 and Comparative Example 1 The magnetic coating materials of Examples 1 to 5 were prepared as follows. That is, the following hexagonal barium ferrite 80 parts by weight [specific surface area: 50 m 2 / g, coercive force 750 Oe plate ratio: 6] S-compound (see Table 1) (see Table 1) polyurethane 6 parts by weight [Kyowa Fermentation Industry: Esten 5701 F1] Vinyl chloride / vinyl acetate resin 6 parts by weight [TA-5C by Nisshin Chemical Co., Ltd.] α-alumina 5 parts by weight [Sumitomo Chemical Co., Ltd. AKP-20] Oleyl oleate 5 parts by weight Carbon black 5 Parts by weight [Mitsubishi Kasei Co., Ltd. # 3950] Garfac RE610 3 parts by weight [Toho Chemical Co., Ltd.] 400 parts by weight of cyclohexanone After mixing and dispersing a composition consisting of 400 parts by weight with a sand grinder, 10 parts by weight of Coronate L (Japan Polyurethane ( Strain): low molecular weight isocyanate) was added and mixed in a high speed disperser to prepare a magnetic paint.
【0063】また、比較例1の磁性塗料として、実施例
1においてS―化合物に替えて表1記載の化合物とした
以外は全く同じ組成の磁性塗料を全く同じように調整し
た。Further, as the magnetic paint of Comparative Example 1, a magnetic paint having exactly the same composition was prepared in the same manner as in Example 1 except that the S-compound was replaced with the compounds shown in Table 1.
【0064】また実施例6,7の磁性塗料を実施例1〜
5と同様にして調整した。すなわち、以下の 六方晶バリウムフェライト 80重量部 [比表面積:50m2 /g、抗磁力 750 Oe 板状比:6] S―化合物(表1参照) (表1参照) ポリウレタン 4重量部 [協和醗酵工業;エステン5701 F1 ] スルホン酸塩基等含有樹脂 2重量部 [MR110 (実施例6)、TP-249(実施例7)] 塩ビ・酢ビ樹脂 4重量部 [日信化学(株)TA-5C ] α―アルミナ 5重量部 [住友化学(株)AKP-20] オレイン酸オレイル 5重量部 カーボンブラック 5重量部 [三菱化成(株)#3950 ] ガーファック RE610 3重量部 [東邦化学(株)] シクロヘキサノン 400重量部 よりなる組成物をサンドグラインダーで混合分散した
後、 コロネートL 10重量部 (日本ポリウレタン(株):低分子量イソシアナ-ト ) を添加し、さらに高速ディスパー中で混合し、磁性塗料
を調製した。Further, the magnetic paints of Examples 6 and 7 were applied to Examples 1 to 1.
It adjusted like 5th. That is, the following hexagonal barium ferrite 80 parts by weight [specific surface area: 50 m 2 / g, coercive force 750 Oe plate ratio: 6] S-compound (see Table 1) (see Table 1) polyurethane 4 parts by weight [Kyowa Fermentation Industry: Esten 5701 F1] 2 parts by weight of resin containing sulfonate group [MR110 (Example 6), TP-249 (Example 7)] 4 parts by weight of vinyl chloride / vinyl acetate resin [Nissin Chemical Co., Ltd. TA-5C ] Α-alumina 5 parts by weight [Sumitomo Chemical Co., Ltd. AKP-20] Oleyl oleate 5 parts by weight Carbon black 5 parts by weight [Mitsubishi Kasei Co. # 3950] Garfac RE610 3 parts by weight [Toho Chemical Co., Ltd.] Cyclohexanone (400 parts by weight) was mixed and dispersed in a sand grinder, 10 parts by weight of Coronate L (Nippon Polyurethane Co., Ltd .: low molecular weight isocyanate) was added, and the mixture was further mixed in a high-speed disperser, Sex paint was prepared.
【0065】なお、ここでMR110は日本ゼオン
(株)のスルホン酸塩基含有塩ビ・酢ビであり、TP―
249は日本合成(株)のスルホン酸塩基含有ポリエス
テルポリウレタンである。Here, MR110 is a vinyl chloride / vinyl acetate containing sulfonate group of Nippon Zeon Co., Ltd., and TP-
249 is a sulfonate group-containing polyester polyurethane manufactured by Nippon Gosei Co., Ltd.
【0066】得られた磁性塗料は15℃で24時間熟成
させた後、厚さ75μmのポリエチレンテレフタレート
の片面上に乾燥後の厚みが2.5μmとなるように塗布
し、無配向化処理後乾燥し、次いで磁性層にカレンダー
加工を施した。さらに裏面にも同様の処理を実施した。
60℃、100時間熱処理後、円板状に打ち抜き磁気デ
ィスクを作成した。この磁気ディスクの特性を表1に示
す。The magnetic coating material thus obtained was aged at 15 ° C. for 24 hours, and then applied on one surface of polyethylene terephthalate having a thickness of 75 μm so that the thickness after drying was 2.5 μm, followed by non-orientation treatment and drying. Then, the magnetic layer was calendered. Further, the same treatment was performed on the back surface.
After heat treatment at 60 ° C. for 100 hours, a disk-shaped magnetic disk was punched out. The characteristics of this magnetic disk are shown in Table 1.
【0067】S―化合物を使用することにより、表1に
示す如く、塗料の分散性、特に分散安定性の向上が著し
い。さらに工業的製品においては作り始めと作り終りの
製品に品質のバラツキが出ることは好ましくないが、S
―化合物の使用により塗料が安定化しているため品質の
バラツキもまた最小限(ハイパスモジュレーションにて
評価)におさえられている。By using the S-compound, as shown in Table 1, the dispersibility of the coating composition, especially the dispersion stability, is remarkably improved. Furthermore, in industrial products, it is not desirable that the quality of the products at the beginning and the end of the production will vary.
-Variation in quality is also minimized (evaluated by high pass modulation) because the paint is stabilized by the use of compounds.
【0068】さらにS/N比が大巾に向上している。Further, the S / N ratio is greatly improved.
【0069】なお、表1のS/N比および塗布性は比較
例1を基準ディスク、基準塗液としたもので表示した。
また表1のS―化合物の量の単位は重量部である。The S / N ratios and coating properties in Table 1 are shown by using Comparative Example 1 as a reference disk and a reference coating liquid.
The unit of the amount of S-compound in Table 1 is parts by weight.
【0070】[0070]
【表1】 [Table 1]
【0071】[0071]
【実施例8〜13、比較例2,3】実施例8〜10の磁
性塗料をCo―被着γ酸化鉄を用いて以下のように調整
した。すなわち、下記の Co―被着γ酸化鉄 70重量部 (比表面積40m2 /g、抗磁力750 Oe 針状比 10) S―化合物(表2参照) 3重量部 スルホン酸塩基等含有樹脂(表2参照)6重量部 ガーファック RE610(東邦化学(株))3重量部 ポリウレタン 6重量部 (大日本インキ化学(株):スハ゜ンテ゛ックス T-5250) 塩ビ・酢ビ樹脂 8重量部 (日信化学(株)TA-5C ) α―アルミナ 4重量部 (住友化学(株)AKP-20) カーボンブラック 6重量部 (三菱化成(株)#3950 ) オレイン酸オレイル 6重量部 シクロヘキサノン 400重量部 よりなる組成物をサンドグラインダーで混合分散した
後、 コロネートL 10重量部 (日本ポリウレタン(株):低分子量イソシアナ-ト ) を添加し、さらに高速ディスパー中で混合し、磁性塗料
を調製した。Examples 8 to 13 and Comparative Examples 2 and 3 The magnetic coating materials of Examples 8 to 10 were prepared as follows using Co-adhered gamma iron oxide. That is, the following Co-adhered γ iron oxide 70 parts by weight (specific surface area 40 m 2 / g, coercive force 750 Oe, acicular ratio 10) S-compound (see Table 2) 3 parts by weight Resin containing sulfonate group (Table 2) 6 parts by weight Garfac RE610 (Toho Kagaku Co., Ltd.) 3 parts by weight Polyurethane 6 parts by weight (Dainippon Ink and Chemicals, Inc .: Spandex T-5250) 8 parts by weight vinyl chloride / vinyl acetate resin (Nissin Chemical ( TA-5C) α-alumina 4 parts by weight (Sumitomo Chemical Co., Ltd. AKP-20) Carbon black 6 parts by weight (Mitsubishi Kasei Co. # 3950) Oleyl oleate 6 parts by weight Cyclohexanone 400 parts by weight Was mixed and dispersed with a sand grinder, 10 parts by weight of Coronate L (Nippon Polyurethane Co., Ltd .: low molecular weight isocyanate) was added, and further mixed in a high speed disperser to prepare a magnetic coating material.
【0072】また比較例2として、実施例8においてそ
のS―化合物に替えて表2の化合物を用いた以外は全く
同様にして調整した磁性塗料を用意した。As Comparative Example 2, a magnetic coating material prepared in exactly the same manner as in Example 8 except that the compound of Table 2 was used instead of the S-compound was prepared.
【0073】更に実施例11〜13の磁性塗料として金
属鉄磁性粉を用いて以下のように調整した。すなわち、
下記の 金属鉄磁性粉 70重量部 (比表面積47m2 /g、抗磁力1500 Oe 針状比 10) S―化合物(表2参照) 3重量部 スルホン酸塩基等含有樹脂(表2参照)6重量部 ガーファック RE610(東邦化学(株))3重量部 ポリウレタン 6重量部 (大日本インキ化学(株):スハ゜ンテ゛ックス T-5250) 塩ビ・酢ビ樹脂 8重量部 (日信化学(株)TA-5C ) α―アルミナ 4重量部 (住友化学(株)AKP-20) カーボンブラック 6重量部 (三菱化成(株)#3950 ) オレイン酸オレイル 6重量部 シクロヘキサノン 400重量部 よりなる組成物をサンドグラインダーで混合分散した
後、 コロネートL 10重量部 (日本ポリウレタン(株):低分子量イソシアナ-ト ) を添加し、さらに高速ディスパー中で混合し、磁性塗料
を調製した。Further, magnetic iron metal magnetic powder was used as the magnetic coating material of Examples 11 to 13 to make the following adjustments. That is,
70 parts by weight of the following metallic iron magnetic powder (specific surface area 47 m 2 / g, coercive force 1500 Oe needle-like ratio 10) S-compound (see Table 2) 3 parts by weight Resin containing sulfonate group (see Table 2) 6 parts by weight Part Garfac RE610 (Toho Kagaku Co., Ltd.) 3 parts by weight Polyurethane 6 parts by weight (Dainippon Ink and Chemicals Inc .: Spandex T-5250) Vinyl chloride / vinyl acetate resin 8 parts by weight (Nissin Chemical Co., Ltd. TA-5C) ) Α-alumina 4 parts by weight (Sumitomo Chemical Co., Ltd. AKP-20) Carbon black 6 parts by weight (Mitsubishi Kasei Co., Ltd. # 3950) Oleyl oleate 6 parts by weight Cyclohexanone 400 parts by weight Mix a composition with a sand grinder. After the dispersion, 10 parts by weight of Coronate L (Nippon Polyurethane Co., Ltd .: low molecular weight isocyanate) was added and further mixed in a high-speed disper to prepare a magnetic paint.
【0074】また比較例3として、実施例11において
そのS―化合物に替えて表2の化合物を用いた以外は実
施例11と全く同様にして調整した磁性塗料を用意し
た。As Comparative Example 3, a magnetic coating material prepared in exactly the same manner as in Example 11 except that the S-compound in Example 11 was replaced with the compound in Table 2 was prepared.
【0075】得られた磁性塗料は、15℃で24時間熟
成させた後、厚さ75μmのポリエチレンテレフタレー
トフイルム上に乾燥後の厚さがCo―被着γ酸化鉄の場
合1.0μm、金属鉄系強磁性粉の場合2.7μmとな
るように塗布し、無配向処理後乾燥し、次いで磁性層に
カレンダー加工を施した。以下、実施例1〜7と同様に
して磁気ディスクを作成した。The magnetic coating material thus obtained was aged at 15 ° C. for 24 hours, and then dried on a polyethylene terephthalate film having a thickness of 75 μm. In the case of the system ferromagnetic powder, it was coated so as to have a thickness of 2.7 μm, non-oriented and dried, and then the magnetic layer was calendered. Hereinafter, magnetic disks were prepared in the same manner as in Examples 1 to 7.
【0076】この磁気ディスクの特性を表2に示す。な
お、表2においてS/N比、塗布性は、実施例8〜10
においては比較例2を、実施例11〜13においては比
較例3を基準ディスク、基準塗液としたもので表示し
た。また表2のスルホン酸塩基等含有樹脂の欄のTP2
49,MR110は前記実施例6,7と同じである。Table 2 shows the characteristics of this magnetic disk. In Table 2, the S / N ratio and the coatability are shown in Examples 8 to 10.
Comparative Example 2 is shown in Comparative Example 3 and Comparative Example 3 in Examples 11 to 13 is shown as a reference disk and a reference coating liquid. In addition, TP2 in the column of resin containing sulfonate group etc. in Table 2
49 and MR110 are the same as in the sixth and seventh embodiments.
【0077】[0077]
【表2】 [Table 2]
Claims (6)
結合剤を含有する磁性塗膜を設けてなる磁気記録媒体に
おいて、該磁性磁性塗膜中に分子内にSH基を含む化合
物を前記強磁性粉100重量部に対して0.01〜20
重量部含有することを特徴とする磁気記録媒体。1. A magnetic recording medium comprising a nonmagnetic support and a magnetic coating film containing at least a ferromagnetic powder and a binder, wherein the magnetic magnetic coating film contains a compound containing an SH group in the molecule. 0.01 to 20 with respect to 100 parts by weight of ferromagnetic powder
A magnetic recording medium containing a part by weight.
0重量部に対して0.5〜13重量部である請求項1記
載の磁気記録媒体。2. The ferromagnetic powder 10 having a content of the compound.
The magnetic recording medium according to claim 1, wherein the amount is 0.5 to 13 parts by weight with respect to 0 parts by weight.
れる化合物である請求項1または2記載の磁気記録媒
体。 X―(SH)m …(I) (Xは炭化水素基、mは1〜4の整数。)3. The magnetic recording medium according to claim 1, wherein the compound is a compound represented by the following general formula (I). X- (SH) m ... (I) (X is a hydrocarbon group, and m is an integer of 1 to 4.)
以上である請求項1〜3記載のいずれかの磁気記録媒
体。4. The compound has an atmospheric pressure boiling point of 150 ° C.
It is above, The magnetic recording medium in any one of Claims 1-3.
ベタイン基の少なくとも1種を1×10-6当量/g(樹
脂)以上含有する極性基含有樹脂を前記強磁性粉100
重量部に対して0.1〜50重量部含有する請求項1〜
4記載のいずれかの磁気記録媒体。5. The ferromagnetic powder 100, wherein the binder is a polar group-containing resin containing at least one of a sulfonate group and a sulfobetaine group at 1 × 10 −6 equivalent / g (resin) or more.
0.1 to 50 parts by weight with respect to parts by weight.
4. The magnetic recording medium according to any one of 4 above.
イト、Co―被着γ酸化鉄、または金属粉末である請求
項1〜5記載のいずれかの磁気記録媒体。6. The magnetic recording medium according to claim 1, wherein the ferromagnetic powder is hexagonal barium ferrite, Co-coated γ-iron oxide, or metal powder.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30560091A JPH05120672A (en) | 1991-10-25 | 1991-10-25 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30560091A JPH05120672A (en) | 1991-10-25 | 1991-10-25 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05120672A true JPH05120672A (en) | 1993-05-18 |
Family
ID=17947101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30560091A Pending JPH05120672A (en) | 1991-10-25 | 1991-10-25 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05120672A (en) |
-
1991
- 1991-10-25 JP JP30560091A patent/JPH05120672A/en active Pending
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